25A07 Comparison
| photo | price | summary | rating |
|---|---|---|---|
 | $11.00 | Condition is Open box, Quam SPEAKER 25A07 2.5" PM VC IMP 3.2 NIB NEW OPEN BOX, shipping cost = $5.99 | 100.0% |
 | $16.15 | Condition is Open box, Quam 25A07Z45 2" Intercom Speaker 45 Ohms, FREE SHIPPING | 99.8% |
 | $19.95 | Condition is Open box, Quam 25A07Z45 2" Intercom Speaker 45 Ohms Unused, shipping cost = $13.36 | 100.0% |
| photo | price | summary | rating |
|---|---|---|---|
 | $19.99 | Condition is Used, QUAM NICHOLS 25A07Z8k SPEAKER FREE SHIPPING, FREE SHIPPING | 99.5% |
 | $12.00 | Condition is Used, Quam Intercom Speaker PN 25A07Z45, shipping cost = $15.89 | 99.7% |
| photo | price | summary | rating |
|---|---|---|---|
 | $12.95 | Condition is New, QUAM NICHOLS CO. LOUD SPEAKER # 25A07Z16 NSN: 5965-00-111-2073 5 WATTS, shipping cost = $8.95 | 100.0% |
 | $75.00 | Condition is New, Quam 25A07Z8 Speaker 2 in .52 Oz 8-10 Ohms Speaker Lot.6 Speakers New/Old, shipping cost = $16.45 | 100.0% |
| photo | price | summary | rating |
|---|---|---|---|
 | $59.00 | Condition is New other (see details), QUAM Permanent Loudspeaker, P/N: 25A07Z8 (EB2509191878), shipping cost = $ | 99.4% |
The Quam 25A07 1/2W Speaker Radio Transistor Supply is a versatile and powerful component designed for use in various audio applications, particularly in radios and small speakers. This transistor is a 1/2 watt, general-purpose, NPN, bipolar type, which makes it an excellent choice for amplifying weak signals and driving low-power speakers.
The Quam 25A07 boasts a high current gain of approximately 180, enabling it to amplify small input signals effectively. It also has a relatively low hFE (forward current gain) of around 12, making it suitable for applications where a moderate level of current amplification is required. The transistor's maximum collector-emitter voltage is 45V, and it can handle a maximum collector current of 250mA.
One of the standout features of this transistor is its compact size, which makes it perfect for use in portable or compact audio devices. Measuring just 1.5 inches by 2.1 inches, the Quam 25A07 can be easily integrated into even the most space-constrained designs.
The transistor is also well-known for its robustness and reliability. It has a high power dissipation rating of 1.3 watts, allowing it to handle demanding audio applications without overheating. Additionally, it is designed to operate over a wide temperature range (-55 C to 125 C), ensuring that it remains functional under a variety of environmental conditions.
The Quam 25A07 Speaker Radio Transistor Supply comes in a TO-56 package, which is a standard size for small transistors. This packaging type is known for its excellent thermal performance, allowing the transistor to dissipate heat effectively and maintain stable operation.
To ensure optimal performance, the Quam 25A07 should be used with appropriate external components, such as resistors, capacitors, and diodes. The manufacturer recommends a minimum base-emitter voltage of 0.7V and a maximum base current of 10mA. Proper biasing and connection to the power supply are also crucial for achieving the best possible results.
In summary, the Quam 25A07 1/2W Speaker Radio Transistor Supply is a versatile and reliable component, ideal for use in a wide range of low-power audio applications. Its compact size, high current gain, and robust design make it an excellent choice for radio and speaker amplification, as well as other applications where efficient amplification of weak signals is required.
The Quam QA-25A07 1/2W Attenuator and Speaker Supply is a component used in various audio applications, especially for reducing the volume of high-power audio signals to protect the sensitivity of speakers. Here are some potential pros and cons of buying this component:
Pros:1. Protection of Speakers: The main function of this component is to protect speakers from being damaged by high-power audio signals. By using an attenuator and speaker supply, you can ensure that the speakers receive the correct amount of power, preventing potential damage.
2. Versatile Application: This component can be used in various audio applications, including public address systems, audio amplifiers, and sound systems. It can be used with different types of speakers, making it a versatile component for audio enthusiasts and professionals.
3. Easy Installation: The Quam QA-25A07 1/2W Attenuator and Speaker Supply is easy to install, making it a convenient solution for those who want to set up a sound system without the need for complex wiring or setup procedures.
4. Durable Construction: The component is built with high-quality materials, ensuring that it can withstand the rigors of regular use in audio applications.
Cons:1. Limited Power Handling: The Quam QA-25A07 1/2W Attenuator and Speaker Supply is designed to handle only a limited amount of power, making it unsuitable for high-power audio applications. If you need to power high-powered speakers, you may need to consider a more powerful attenuator and speaker supply.
2. Additional Cost: The cost of this component may be an additional expense for those building a sound system from scratch. While it is an essential component for protecting speakers, it may add to the overall cost of the system.
3. Size and Weight: The Quam QA-25A07 1/2W Attenuator and Speaker Supply is a relatively small component, but it may still add to the size and weight of your audio setup. This may be a consideration for those who are building a portable sound system or have limited space.
In conclusion, the Quam QA-25A07 1/2W Attenuator and Speaker Supply is a valuable component for protecting speakers in various audio applications. Its versatility, easy installation, and durable construction make it a popular choice among audio enthusiasts and professionals. However, its limited power handling, additional cost, and size and weight may be drawbacks for some. Ultimately, the decision to buy this component depends on the specific requirements of your audio application.
Recommendation:If you are building a sound system and need to protect your speakers from high-power audio signals, the Quam QA-25A07 1/2W Attenuator and Speaker Supply is a recommended component. Its versatility, durability, and ease of installation make it a convenient and effective solution. However, if you require more power handling, consider a more powerful attenuator and speaker supply to meet your specific needs.
Details:
I do process and get orders to the shipping service rapidly, many times within 12 hours depending on day. These are not promises. Good working. Visible crease in cone.
I stand by my , but am no expert. Please see pictures for actual details and inclusions. As acquired with light soiling, oxidation and surface wear.
specifications vintaspeaker:
- brand: Quam
- mpn: 25a07
- part type: Speaker Radio Supply
- country/region of manufacture: United States
returns vintaspeaker:
- time: 30 days
- paid by: buyer
- method: money back
- policy: returns accepted
seller vintaspeaker:
- rating: 100.0%
- city: deep river, connecticut
- # reviews: 6162
general vintaspeaker:
- category: Electronics > Audio Video > Vintage Speakers
payments vintaspeaker:
- wallet: google-pay
- credit card: mastercard
- other
offer vintaspeaker:
- options: ship-to-home
- best offers: true
- prices: $11.00–$75.00
- item condition:
- Open box
- Used
- New
- New other (see details)
- in stock #: 5
- sold #: 19
- started: february 16, 2025
- availability: in stock
shipping vintaspeaker:
- transit: 5-9 days
- type: fixed
- class: economy
- service: economy